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Effect of pre-crack in the fracture properties of steel pipes used in oil type API 5L X70

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Abstract

In this work, we studied the impact resistance of the weld metal of a steel API 5L X70, assessing the influence of geometry and dimensions of the specimen fracture toughness. Curves resistance to crack propagation ductile (J–R) following the methodology “Single Specimen” together with the variation of the elastically generated by the crack initiation (CMOD) providing a load versus displacement/length graph for crack (ASTM E1820-05). Tests were conducted on samples according to the standard SE(T) to surface cracks (a/W = 0.2) and deep (a/W = 0.5) and the ratios W/B = 1.0 and 2.5, keeping the plane strain. The results show that regardless of initial crack dimension, no significant differences were observed in the curves J–R, confirming the similarity of the curves for W/B = 1.0 for any a/W. However, most of the samples showed anomalous ductile crack growth, generating high plane stress along the sides of the notches. Samples tested according to the J–R curve showed no cracks of encapsulating, and the values of the crack length a i and a f are very close to those obtained by the elastic flexibility variation method. Since delamination influenced the properties of impact for increased efforts to crack propagation, mainly by microstructural conditions of the samples.

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Acknowledgments

Thanks to USIMINAS and the Center for Materials Testing and Failure Analysis, NEMAF, the School of Engineering of São Carlos, University of São Paulo, Department of Materials Engineering, Aeronautical and Automobile by supporting the development of this work and the Department of Materials Federal Technological University of Paraná-Cornelio Procópio-PR, BRAZIL for assistance in the publication.

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Authors and Affiliations

  1. Mechanical Engineering Department, UTFPR, Cornélio Procópio, Brazil

    Julio C. S. Francisco & Joao R. S. Moreno

  2. Materials Engineering Department, USP, São Carlos, Brazil

    Waldek W. B. Filho & Cassio O. F. T. Ruchert

Authors
  1. Julio C. S. Francisco
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  2. Joao R. S. Moreno
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  3. Waldek W. B. Filho
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  4. Cassio O. F. T. Ruchert
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Correspondence to Joao R. S. Moreno.

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Technical Editor: Eduardo Alberto Fancello.

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Francisco, J.C.S., Moreno, J.R.S., Filho, W.W.B. et al. Effect of pre-crack in the fracture properties of steel pipes used in oil type API 5L X70. J Braz. Soc. Mech. Sci. Eng. 38, 2117–2127 (2016). https://doi.org/10.1007/s40430-015-0469-3

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  • DOI: https://doi.org/10.1007/s40430-015-0469-3

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